Safety envelop and box.



No. 838,964. PATENTED DEC.18, 1906. W. H. DOBSON & W. GALLAGHER. SAFETY ENVBLOP AND BOX.

APPLICATION FILED JAN. 12. 1906.

INVENTORS WllJLii-ilii ll. DO OF HARlii enrich.

bON, AND WILLIAM GALLAGHER, OF

ELIZABETH, NEW JL'CRSEY.

SAFETY ENVELOP AND 80X.

Specification of Letters Patent.

Patented. Dec. 18, 1906.

" *plicetion filed January 12, 1906. Serial No. 296,751.

Cur invention embodied in the improved construction whereby an envelop or be may be closed by engagement of the flaps or opposite folding portions thereof, the engagement being such that the envelop or box cannot be opened without breaking it or rupturing {L portion of the some.

The details of construction and arrangement of purts are hereinafter described, and illustrated in the accoi'npsnying draw ings, in which- Fi ure '1 is a plan view of the-blank from which a letter-envelop is formed. Fig. 2 is a plan view showing the end flaps folded and engaged. Fig. 3 is a lam view'of the envelop completely folde and closed. Fig. 3 is an end view of the tongue and wings of the ioldahle flap, showing the position the wings Figs. 4, 5. and 6 are occupy when folded. detailviews whichwill be hereinafter specifically referred to, the sectional view, Fig. 6, being on the line 6 6 of Fi 5. Fig. 7 is t1 erspective view of an oblong rectangular liox having its flaps constructed and engaged 'a'ccording to our invention.

Referring more particularly to Fig. 1, 1 and 1 indicate the folding end flops, and 2 2 the folding side flaps, of the envelop. The dotted lines (shown in Figs. 1 and '2) indicate lines of fold for the respective flaps. The end llzips 1 and 2 are provided, respectively, with the slots 3 and 4, the some being arranged parallel to the ends of such llnps. The flaps 1 2 are provided with end portions constructed and adapted to enter the slots-S 4, respectively, and to engage or look therewith-that is to say, each of the flaps 1 2 is to )ered toward its outer end, which is prefernb y pointed, as indicated at 5, and provided with side extensions or, wings 6. The outer ends 7 of these wings are inclined, as shown, for a purpose hereinafter stated. When the envelop is made up ready for use, the wings 6 are folded inward on the lines :0 'y, so that they assume the position indicated in Fins. 4,

5, and 6tha.tis to say, each of the extensions or wings 6 folded inward on the lines :L and then sent or folded outward on the lines y, thus forming reverse curves, or practically en 5 shape, as will be seen by reference to Fig. 6. The width of the terminal or point-ed portions 5 of the flaps 1 2 is about seine the width of the slots 3 .4 which to receive them, but, {LS indicated in Figs.

4, 5, the inclined ends 7 of the wings 6 extend laterally to a greater distance. Thus when the flaps 1 2 are to be engaged with the opposing flups 1' 2 the operation is as follows: Referring to the flaps 2 2 for convenience of description, let it be sup osed that these [laps have been folded on t 16 dotted lines indie-med, so that 2 overlies 2 and the wings or extensions '6 have been folded twice on the. lines :0 y, as before described, so that they are in the position indicated in Figs. 4, 5, and 6. Then the pointed or reduced ends of the flap are inserted in the slot 4 of flap 2 and pushed completely through the same, so that the wings 6 will lie on. the under side of the flap 2 n-ndengnge the edgesof the slot.

In Fig. 4 the reduced and pointed end 5 is shown introduced part way intothe slot 4 the inclined ends 7 of the wings being in contact with the end portions of the slot 4', and since they extend laterally farther than the width of the slot it is apparent that the wings must yield inwardly in order to pass through the slot, which is permitted by the elasticity of the folds m y.

The same elasticityinsoon as they shall have passed through the slot, so that a locking engagement is formed, as indicated in Fig. 5, which shows the. inner sides of the llzips 2 2; while Fig. 4 shows .the outer sides of the some before the engagement is fully e'll'ectod.

.[t is nee: u ury that the wings should have due elasticity at the inner told 01;, or, in other words, be adapted to yield inward when the inclined ends pass in Contact with the ends of the slot 4, formed in zi-lincinentwith the lines of fold a; and on the inner side of the wings, as shown in Figs. 1 and 2. 1n folding the envelop, the

end flops 1. 1 are folded first, as indicated in It will be perceived that by the construe-- tion and connection of the enge porl ions 1 for this purpose slits 8'are as above desoribfi-xl We form a closure which is effected the instant the torminal porti on of one fiap is inserted in the slot of the other and that the engagement is such that it cannot be broken Without rupturing tho envelop to greater or loss extent in other ,words, We form a perfect closuro and look by the simplg insorzion of one Hap in 'ilio slotof tho other. It is apparent; than, the llzips of paper boxes may be constructed and adapted to engage in the same manner as in the case of the envelop, and in Fig.7 we illustrate a lmx having flaps thus folded and engaged.

The inmroved paper onvolo posi foltlablo flaps, one provh Gil with a slot andt a other with a tongue having laterallyprojoctingwings 6, Whose upper and lower l haying op- I edgos are parallel, and Whose onds are in clinogi or sloped from the outer edge inward their entire width and, provided with transverse slits 8 lama-iml :nljawntly to the body of sari-Ll. tongue, the said wings lmving also two 3* r ollol transverse in: of fold, a? undfu, the lino: 00 being in alinomont with. the aforesaid sl' whereby the wings may be folded train sve into S shape, the fiCUtQ-ldlglfid ooriwrs of wings projemn laterally to an extent groaitor than his Widr of 111i: slot in the opposin- 11:: nas and for 1 h 'rposo specified.

l lililAM lrl. DOB-60X l LLIAM GALLAG HE v iitl'iossos EDWARD 'lnonr, JOHN J. MEIR. 

